JP5281836B2 - Electrode assembly and secondary battery using the same - Google Patents

Electrode assembly and secondary battery using the same Download PDF

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JP5281836B2
JP5281836B2 JP2008180579A JP2008180579A JP5281836B2 JP 5281836 B2 JP5281836 B2 JP 5281836B2 JP 2008180579 A JP2008180579 A JP 2008180579A JP 2008180579 A JP2008180579 A JP 2008180579A JP 5281836 B2 JP5281836 B2 JP 5281836B2
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鍾九 金
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    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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Description

本発明は、電極組立体及びこれを用いた二次電池（Ｅｌｅｃｔｒｏｄｅ ａｓｓｅｍｂｌｙ ａｎｄ ｓｅｃｏｎｄａｒｙ ｂａｔｔｅｒｙ ｕｓｉｎｇ ｔｈｅ ｓａｍｅ）に関する。   The present invention relates to an electrode assembly and a secondary battery (Electrode assembly and secondary battery using the same) using the same.

近年、携帯電話、ノートパソコン、ビデオカメラなどの小型化及び軽量化された電気機器や電子機器が活発に開発及び生産されている。   In recent years, miniaturized and lightened electrical and electronic devices such as mobile phones, notebook computers, and video cameras have been actively developed and produced.

このような携帯用電気機器や電子機器は、別途の電源が備えられてない場所でも動作するように電池パックを内蔵し、かかる電池パックを駆動電源として利用している。かかる内蔵された電池パックは、所定レベルの電圧を出力して携帯用電気機器や携帯用電子機器を所定の期間だけ駆動させることができるように、その内部に少なくとも一つの電池を備える。   Such portable electric devices and electronic devices incorporate a battery pack so as to operate even in a place where a separate power source is not provided, and use the battery pack as a driving power source. Such a built-in battery pack includes at least one battery therein so that a predetermined level of voltage can be output to drive the portable electric device or portable electronic device for a predetermined period.

最近では、実用性及び経済性などを考慮して、再充電が可能であり、小型化及び大容量化が可能な二次電池が、携帯用電気機器や携帯用電子機器の電池として多く採用されている。   Recently, in view of practicality and economy, secondary batteries that can be recharged and that can be reduced in size and capacity are widely used as batteries for portable electric devices and portable electronic devices. ing.

このような二次電池のうち、リチウム二次電池は、携帯用電子機器の電源として広く普及しているニッケル−カドミウム（Ｎｉ−Ｃｄ）電池やニッケル−水素（Ｎｉ−ＭＨ）電池よりもその動作電圧が約３倍も高く、３．６Ｖの動作電圧を有する。また、リチウム二次電池は、単位重量当たりのエネルギー密度も高いため、最近ではその普及が急速に進んでいる。   Among such secondary batteries, lithium secondary batteries operate more than nickel-cadmium (Ni-Cd) batteries and nickel-hydrogen (Ni-MH) batteries that are widely used as power sources for portable electronic devices. The voltage is about three times higher and has an operating voltage of 3.6V. In addition, since lithium secondary batteries have a high energy density per unit weight, they have been rapidly spreading recently.

リチウム二次電池のうち、リチウムイオン二次電池においては、ベアセル（単体の電池セル）は、電極組立体が缶の内部に収容された構造を有する。すなわち、リチウムイオン二次電池のベアセルは、電極組立体を缶に収納後、キャップ組立体で蓋をし、缶の内部に電解液を注入口から注入して、その後注入口を密封することにより形成されることができる。上記電極組立体は、陽極板、陰極板及び、セパレータを含んで構成される。また、上記缶は、アルミニウムまたはアルミニウム合金からなることができる。   Among lithium secondary batteries, in a lithium ion secondary battery, a bare cell (single battery cell) has a structure in which an electrode assembly is accommodated inside a can. In other words, a bare cell of a lithium ion secondary battery has a structure in which an electrode assembly is housed in a can, covered with a cap assembly, an electrolyte is injected into the inside of the can from an inlet, and then the inlet is sealed. Can be formed. The electrode assembly includes an anode plate, a cathode plate, and a separator. The can can be made of aluminum or an aluminum alloy.

一方、リチウム二次電池のうち、上記セパレータがポリマーで形成されたリチウムポリマー二次電池においては、電極組立体が缶に収容される代わりに、パウチに収容される場合がある。すなわち、ポリマーで形成されたリチウムポリマー二次電池のセパレータは、電解液としての役割を果たすことができ、セパレータに電解液成分を含浸させて使用するため、電解液が漏れるといった問題が起こりにくく、電極組立体の収納容器として、缶を使用せずに、パウチを用いる場合がある。   On the other hand, among lithium secondary batteries, in the lithium polymer secondary battery in which the separator is formed of a polymer, the electrode assembly may be housed in a pouch instead of being housed in a can. In other words, the lithium polymer secondary battery separator formed of a polymer can serve as an electrolyte solution, and since the separator is impregnated with an electrolyte solution component, the problem of electrolyte leakage is unlikely to occur. As a container for the electrode assembly, a pouch may be used without using a can.

電極板は、一般に、金属箔からなる電極集電体の表面に電極活物質を含むスラリーを塗布することによって形成される。   The electrode plate is generally formed by applying a slurry containing an electrode active material to the surface of an electrode current collector made of a metal foil.

電極組立体は、陽極板、陰極板及びセパレータがそれぞれ一枚のストリップ（帯状の形状）からなり、これらが陽極板、セパレータ、陰極板の順に積層されて、ゼリーロール型に巻き取られた構造を有する。   The electrode assembly has a structure in which an anode plate, a cathode plate, and a separator are each composed of a single strip (band-like shape), which are laminated in order of an anode plate, a separator, and a cathode plate, and wound into a jelly roll type. Have

電極集電体には、１つの電極を形成するのに必要な長さ分のスラリーが塗布されて電極活物質層が形成され、電極タブを熔接するなどの必要性によって電極活物質層が塗布されてない無地部が形成される。すなわち、電極集電体には、電極活物質層が形成された集電体被覆領域と、電極活物質層が形成されずに集電体が露出された集電体露出領域とが含まれる。   An electrode active material layer is applied to the electrode current collector according to the necessity of applying an electrode active material layer by applying a slurry of a length necessary to form one electrode. An unfinished plain part is formed. That is, the electrode current collector includes a current collector coating region where the electrode active material layer is formed and a current collector exposed region where the current collector is exposed without forming the electrode active material layer.

ここで、電極集電体にスラリーを塗布し始めるスタート部においては、電極活物質層が連続する部分に比べて塗布されたスラリーが固まって多少突き出される過渡現象が現われる。すなわち、電極集電体にスラリーを塗布する製造工程において、スラリーの塗布を開始する領域においては、スラリーが厚く塗布されてしまい、その部分の電極活物質層が電極活物質層の他の領域よりも突出されて形成されてしまうという現象が生じる。   Here, in the start portion where the slurry starts to be applied to the electrode current collector, a transient phenomenon occurs in which the applied slurry is hardened and protrudes somewhat as compared with the portion where the electrode active material layer is continuous. That is, in the manufacturing process of applying the slurry to the electrode current collector, the slurry is applied thickly in the region where the application of the slurry is started, and the electrode active material layer in that portion is more than the other regions of the electrode active material layer. This also causes a phenomenon that the protrusion is formed.

一方、電極集電体にスラリー塗布が終了する終端部には引き摺られ現象が発生して電極活物質層が連続する部分に比べてスラリーが少なく塗布される。すなわち、電極集電体にスラリーを塗布する製造工程において、スラリーの塗布が終了する領域においては、スラリーが薄く塗布されてしまい、その部分の電極活物質層が電極活物質層の他の領域よりも薄く形成されてしまうという現象が生じる。   On the other hand, a drag phenomenon occurs at the terminal portion where the application of the slurry to the electrode current collector is completed, so that less slurry is applied compared to the portion where the electrode active material layer is continuous. That is, in the manufacturing process of applying the slurry to the electrode current collector, in the region where the application of the slurry is finished, the slurry is thinly applied, and the electrode active material layer in that portion is more than the other regions of the electrode active material layer. However, the phenomenon that the film is formed thinly occurs.

このような電極活物質層のスタート部及び終端部は、電極組立体を巻き取る際に加えられる圧力などの製造工程における圧力や、その他の外部的な圧力が加えられた場合に、陽極板と陰極板とを電気的に絶縁させるセパレータに損傷を与える恐れがある。   The start part and the end part of the electrode active material layer are connected to the anode plate when a pressure in a manufacturing process such as a pressure applied when the electrode assembly is wound or other external pressure is applied. The separator that electrically insulates the cathode plate may be damaged.

上記のようなセパレータが損傷された部分では、陽極板と陰極板との間で内部的な短絡が生じる恐れがある。そして、このような短絡により事故が発生する恐れがあるため、安全面で問題が生じる。更に、上記のように製造工程で圧力が加えられてセパレータに損傷が生じると、電池生産の歩留まりが低下するという問題も発生する。   In the portion where the separator is damaged as described above, an internal short circuit may occur between the anode plate and the cathode plate. And since an accident may occur due to such a short circuit, a problem arises in terms of safety. Furthermore, when pressure is applied in the manufacturing process as described above and the separator is damaged, there is a problem in that the yield of battery production decreases.

そこで、従来は、スラリーを塗布する際のスタート部及び終端部に絶縁層を形成することにより、上記のような問題が発生するのを防止していた（例えば、特許文献１〜特許文献３参照。）。
特開平１０−２４１７３７号公報 特開２００５−２８５６９１号公報 大韓民国特許公開第７０９８６３号 Therefore, conventionally, by forming an insulating layer at the start and end portions when applying the slurry, the above-described problems are prevented from occurring (for example, see Patent Documents 1 to 3). .)
JP-A-10-241737 JP 2005-285691 A Republic of Korea Patent Publication No. 709863

しかし、上記のような従来の電極組立体は、絶縁層が電極活物質層の一部を覆うように設けられるので、電極活物質層の反応面積が減少し、その結果、電池容量が減少するという問題があった。   However, in the conventional electrode assembly as described above, since the insulating layer is provided so as to cover a part of the electrode active material layer, the reaction area of the electrode active material layer is reduced, and as a result, the battery capacity is reduced. There was a problem.

また、電極活物質層の一部を覆うように絶縁層が形成されるので、絶縁層の厚さ分だけゼリーロールの長径が大きくなるという問題もあった。   In addition, since the insulating layer is formed so as to cover a part of the electrode active material layer, there is a problem that the major axis of the jelly roll is increased by the thickness of the insulating layer.

更に、電極活物質層と絶縁層が接着される領域において、各成分の反応によってコバルト成分以外の異種の金属が湧出されるという問題もあった。   Furthermore, in the region where the electrode active material layer and the insulating layer are bonded, there is also a problem that different types of metals other than the cobalt component are generated by the reaction of each component.

そこで、本発明は、このような問題に鑑みてなされたもので、その目的とするところは、効率性を高めることができ、安全性を向上させることができる電極組立体及びこれを用いた二次電池を提供することにある。   Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide an electrode assembly capable of improving efficiency and improving safety, and two using the same. The next battery is to provide.

上記課題を解決するために、本発明のある観点によれば、陽極集電体と、上記陽極集電体上に形成された陽極活物質層と、上記陽極集電体上に設けられた陽極集電体露出領域とを備えた陽極板と、陰極集電体と、上記陰極集電体上に形成された陰極活物質層と、上記陰極集電体上に設けられた陰極集電体露出領域とを備えた陰極板と、上記陽極板と上記陰極板との間に介在されるセパレータとを含み、上記陽極活物質層または／および上記陰極活物質層の電極組立体の巻き取り方向の両端のうちの少なくともいずれかの端部に隣接して、上記陽極集電体露出領域または上記陰極集電体露出領域の少なくとも一面に配設される絶縁部材を備えたこと、を特徴とする電極組立体が提供される。   In order to solve the above problems, according to an aspect of the present invention, an anode current collector, an anode active material layer formed on the anode current collector, and an anode provided on the anode current collector An anode plate provided with a current collector exposed region, a cathode current collector, a cathode active material layer formed on the cathode current collector, and a cathode current collector exposure provided on the cathode current collector A cathode plate having a region, and a separator interposed between the anode plate and the cathode plate, and the anode active material layer or / and the cathode active material layer in the winding direction of the electrode assembly An electrode comprising an insulating member disposed on at least one surface of the anode current collector exposed region or the cathode current collector exposed region adjacent to at least one of both ends. An assembly is provided.

このような本発明にかかる電極組立体によれば、陽極集電体上に形成された陽極活物質層の電極組立体の巻き取り方向の両端部、または、陰極集電体上に形成された陰極活物質層の電極組立体の巻き取り方向の両端部の、少なくともいずれかに隣接して、絶縁部材が陽極集電体上または陰極集電体上に設けられる。これにより、陽極活物質層の電極組立体の巻き取り方向の両端部や、陰極活物質層の電極組立体の巻き取り方向の両端部が、電極組立体を巻き取る際に、あるいは、電極組立体に外部から圧力が加えられた際に、セパレータを破損させることを防止することができる。また、上記絶縁部材は、陽極活物質層または陰極活物質層と重ならないように設けられるため、上記絶縁部材を設けることにより、陽極板または陰極板の厚みが増したり、電極組立体の直径が増加したり、活物質層の反応面積が減少するといった影響が出ることは殆どない。更に、上記絶縁部材は、陽極活物質層または陰極活物質層と接触しないように設けられるので、絶縁部材と活物質層との接着部において発生していた異種金属の湧出も生じなくなる。   According to such an electrode assembly according to the present invention, the anode active material layer formed on the anode current collector is formed on both ends of the electrode assembly in the winding direction or on the cathode current collector. An insulating member is provided on the anode current collector or the cathode current collector adjacent to at least one of both ends in the winding direction of the electrode assembly of the cathode active material layer. Thus, both ends of the anode active material layer in the winding direction of the electrode assembly and both ends of the cathode active material layer in the winding direction of the electrode assembly are wound when the electrode assembly is wound up, or It is possible to prevent the separator from being damaged when pressure is applied to the solid body from the outside. In addition, since the insulating member is provided so as not to overlap the anode active material layer or the cathode active material layer, by providing the insulating member, the thickness of the anode plate or the cathode plate is increased, or the diameter of the electrode assembly is increased. There is almost no effect of increasing or reducing the reaction area of the active material layer. Furthermore, since the insulating member is provided so as not to come into contact with the anode active material layer or the cathode active material layer, the occurrence of dissimilar metal that has occurred at the bonding portion between the insulating member and the active material layer does not occur.

このとき、上記絶縁部材は、上記陽極活物質層または上記陰極活物質層の上記電極組立体の巻き取り方向の両端部の各端部から、それぞれ３．５ｍｍ以内の間隔だけ離隔された位置に設けられるのがよい。上記のような位置に絶縁部材を設けることにより、陽極活物質層の上記端部や陰極活物質層の上記端部がセパレータを破損させるのを防止することができる。   At this time, the insulating member is separated from each end of the anode active material layer or the cathode active material layer in the winding direction of the electrode assembly by a distance of 3.5 mm or less. It should be provided. By providing the insulating member at the position as described above, the end of the anode active material layer and the end of the cathode active material layer can be prevented from being damaged.

また、上記絶縁部材の厚さは、上記陽極活物質層または上記陰極活物質層の厚さと同一であるのがよい。   The insulating member may have the same thickness as the anode active material layer or the cathode active material layer.

上記絶縁部材は、絶縁テープで形成されることができる。あるいは、上記絶縁部材は、接着層と上記接着層の一面に付着される絶縁フィルムからなることもできる。このとき、上記接着層は、上記陽極活物質層または上記陰極活物質層と接触しないように設けられるのがよい。   The insulating member can be formed of an insulating tape. Alternatively, the insulating member may be composed of an adhesive layer and an insulating film attached to one surface of the adhesive layer. At this time, the adhesive layer is preferably provided so as not to contact the anode active material layer or the cathode active material layer.

ここで、上記陽極活物質層及び上記陰極活物質層は、陽極用スラリーまたは陰極用スラリーが均一に塗布された均一領域及び、上記陽極用スラリーまたは上記陰極用スラリーが均一に塗布されない不均一領域を有することができる。このとき、上記不均一領域は、上記陽極用スラリーまたは上記陰極用スラリーを塗布する際の、塗布開始領域及び塗布終了領域であることができる。そして、上記塗布開始領域は上記均一領域の厚さよりも厚く形成され、上記塗布終了領域は上記均一領域の厚さよりも薄く形成されることができる。   Here, the anode active material layer and the cathode active material layer include a uniform region where the anode slurry or the cathode slurry is uniformly applied, and a non-uniform region where the anode slurry or the cathode slurry is not uniformly applied. Can have. At this time, the non-uniform region may be a coating start region and a coating end region when the anode slurry or the cathode slurry is applied. The application start area may be formed thicker than the uniform area, and the application end area may be formed thinner than the uniform area.

このとき、上記絶縁部材の絶縁フィルムは、上記不均一領域を覆うように設けられてもよい。   At this time, the insulating film of the insulating member may be provided so as to cover the non-uniform region.

また、上記塗布開始領域に隣接して形成された上記絶縁部材の厚さは、上記塗布開始領域の厚さと同一であるのがよい。   In addition, the thickness of the insulating member formed adjacent to the application start region may be the same as the thickness of the application start region.

上記課題を解決するために、本発明の別の観点によれば、外装材と、上記外装材に収容され、陽極集電体と、上記陽極集電体上に形成された陽極活物質層と、上記陽極集電体上に設けられた陽極集電体露出領域とを備えた陽極板と、陰極集電体と、上記陰極集電体上に形成された陰極活物質層と、上記陰極集電体上に設けられた陰極集電体露出領域とを備えた陰極板と、上記陽極板と上記陰極板との間に介在されるセパレータとを含む電極組立体と、を含み、上記電極組立体は、上記陽極活物質層または／および上記陰極活物質層の上記電極組立体の巻き取り方向の両端のうちの少なくともいずれかの端部に隣接して、上記陽極集電体露出領域または上記陰極集電体露出領域の少なくとも一面に配設される絶縁部材を備えたこと、を特徴とする二次電池が提供される。   In order to solve the above problems, according to another aspect of the present invention, an exterior material, an anode current collector housed in the exterior material, and an anode active material layer formed on the anode current collector, An anode plate having an anode current collector exposed region provided on the anode current collector, a cathode current collector, a cathode active material layer formed on the cathode current collector, and the cathode current collector. An electrode assembly including a cathode plate provided with a cathode current collector exposed region provided on an electric body, and a separator interposed between the anode plate and the cathode plate, and the electrode assembly The solid is adjacent to at least one of the ends of the anode active material layer and / or the cathode active material layer in the winding direction of the electrode assembly, and the anode current collector exposed region or the above An insulating member disposed on at least one surface of the exposed area of the cathode current collector is provided. Secondary battery is provided.

このような本発明にかかる二次電池によれば、陽極集電体上に形成された陽極活物質層の電極組立体の巻き取り方向の両端部、または、陰極集電体上に形成された陰極活物質層の電極組立体の巻き取り方向の両端部の、少なくともいずれかに隣接して、絶縁部材が陽極集電体上または陰極集電体上に設けられる。これにより、陽極集電体上に形成された陽極活物質層の電極組立体の巻き取り方向の両端部や、陰極集電体上に形成された陰極活物質層の電極組立体の巻き取り方向の両端部が、電極組立体を巻き取る際に、あるいは、電極組立体に外部から圧力が加えられた際に、セパレータを破損させることを防止することができる。また、上記絶縁部材は、陽極活物質層または陰極活物質層と重ならないように設けられるため、上記絶縁部材を設けることにより、陽極板または陰極板の厚みが増したり、電極組立体の直径が増加したり、活物質層の反応面積が減少するといった影響が出ることは殆どない。更に、上記絶縁部材は、陽極活物質層または陰極活物質層と接触しないように設けられるので、絶縁部材と活物質層との接着部において発生していた異種金属の湧出も生じなくなる。   According to such a secondary battery according to the present invention, the anode active material layer formed on the anode current collector is formed on both ends of the electrode assembly in the winding direction or on the cathode current collector. An insulating member is provided on the anode current collector or the cathode current collector adjacent to at least one of both ends in the winding direction of the electrode assembly of the cathode active material layer. Thus, both ends of the winding direction of the electrode assembly of the anode active material layer formed on the anode current collector and the winding direction of the electrode assembly of the cathode active material layer formed on the cathode current collector It is possible to prevent the separator from being damaged when both ends of the electrode take up the electrode assembly or when pressure is applied to the electrode assembly from the outside. In addition, since the insulating member is provided so as not to overlap the anode active material layer or the cathode active material layer, by providing the insulating member, the thickness of the anode plate or the cathode plate is increased, or the diameter of the electrode assembly is increased. There is almost no effect of increasing or reducing the reaction area of the active material layer. Furthermore, since the insulating member is provided so as not to come into contact with the anode active material layer or the cathode active material layer, the occurrence of dissimilar metal that has occurred at the bonding portion between the insulating member and the active material layer does not occur.

ここで、上記外装材の形状は、円筒型、角柱型または、角に丸みを有する柱型のうちのいずれかの形状に形成されることができる。また、上記外装材は、一方の端部に開口部が形成され、上記開口部にキャップ組立体が装着されるように構成されることができる。   Here, the shape of the exterior material can be formed in any one of a cylindrical shape, a prismatic shape, and a pillar shape having rounded corners. The exterior material may be configured such that an opening is formed at one end, and a cap assembly is attached to the opening.

あるいは、上記外装材は、パウチ型であってもよい。   Alternatively, the exterior material may be a pouch type.

また、上記絶縁部材は、上記陽極活物質層または上記陰極活物質層の上記電極組立体の巻き取り方向の両端部の各端部から、それぞれ３．５ｍｍ以内の間隔だけ離隔された位置に設けられるのがよい。上記のような位置に絶縁部材を設けることにより、陽極活物質層の上記端部や陰極活物質層の上記端部がセパレータを破損させるのを防止することができる。   The insulating member is provided at a position separated from each end of the anode active material layer or the cathode active material layer in the winding direction of the electrode assembly by an interval of 3.5 mm or less. It is good to be done. By providing the insulating member at the position as described above, the end of the anode active material layer and the end of the cathode active material layer can be prevented from being damaged.

また、上記絶縁部材の厚さは、上記陽極活物質層または上記陰極活物質層の厚さと同一であるのがよい。   The insulating member may have the same thickness as the anode active material layer or the cathode active material layer.

上記絶縁部材は、絶縁テープで形成されることができる。あるいは、上記絶縁部材は、接着層と上記接着層の一面に付着される絶縁フィルムからなることもできる。このとき、上記接着層は、上記陽極活物質層または上記陰極活物質層と接触しないように設けられるのがよい。   The insulating member can be formed of an insulating tape. Alternatively, the insulating member may be composed of an adhesive layer and an insulating film attached to one surface of the adhesive layer. At this time, the adhesive layer is preferably provided so as not to contact the anode active material layer or the cathode active material layer.

ここで、上記陽極活物質層及び上記陰極活物質層は、陽極用スラリーまたは陰極用スラリーが均一に塗布された均一領域及び、上記陽極用スラリーまたは上記陰極用スラリーが均一に塗布されない不均一領域を有することができる。このとき、上記不均一領域は、上記陽極用スラリーまたは上記陰極用スラリーを塗布する際の、塗布開始領域及び塗布終了領域であることができる。そして、上記塗布開始領域は上記均一領域の厚さよりも厚く形成され、上記塗布終了領域は上記均一領域の厚さよりも薄く形成されることができる。   Here, the anode active material layer and the cathode active material layer include a uniform region where the anode slurry or the cathode slurry is uniformly applied, and a non-uniform region where the anode slurry or the cathode slurry is not uniformly applied. Can have. At this time, the non-uniform region may be a coating start region and a coating end region when the anode slurry or the cathode slurry is applied. The application start area may be formed thicker than the uniform area, and the application end area may be formed thinner than the uniform area.

このとき、上記絶縁部材の絶縁フィルムは、上記不均一領域を覆うように設けられてもよい。   At this time, the insulating film of the insulating member may be provided so as to cover the non-uniform region.

また、上記塗布開始領域に隣接して形成された上記絶縁部材の厚さは、上記塗布開始領域の厚さと同一であるのがよい。   In addition, the thickness of the insulating member formed adjacent to the application start region may be the same as the thickness of the application start region.

以上説明したように本発明によれば、絶縁部材の接着層が電極活物質層と接触しないように設けられるので、活物質層の反応面積が減少されることを防止することができ、減少されてない面積に相当する分の電池容量を増加させることができる。また、電極活物質層を絶縁部材が覆う構造ではないので、絶縁層部材分の厚さの増加が生じず、ゼリーロールの長径が大きくなることを防止することができる。また、電極活物質層と接着層との接触が発生しないので、電極活物質層と絶縁層とが接着する領域において異種金属が湧出する問題を防止することができる。   As described above, according to the present invention, since the adhesive layer of the insulating member is provided so as not to contact the electrode active material layer, it is possible to prevent and reduce the reaction area of the active material layer. The battery capacity can be increased corresponding to the unoccupied area. In addition, since the insulating member does not cover the electrode active material layer, the thickness of the insulating layer member is not increased, and the major axis of the jelly roll can be prevented from increasing. In addition, since the contact between the electrode active material layer and the adhesive layer does not occur, it is possible to prevent a problem that different kinds of metal spring out in a region where the electrode active material layer and the insulating layer are bonded.

更に、電極活物質層の両端部においてその形状や厚みが不均一に形成されることにより発生するセパレータの損傷を防止することができ、互いに極性が異なる極板間で短絡が発生することを防止して、電極組立体及び二次電池の安全性を向上させることができる。   Furthermore, it is possible to prevent the separator from being damaged due to the non-uniform shape and thickness formed at both ends of the electrode active material layer, and to prevent a short circuit from occurring between plates having different polarities. Thus, the safety of the electrode assembly and the secondary battery can be improved.

以下に添付図面を参照しながら、本発明の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。また、本発明は、ここで説明する実施形態に限られず、他の形態で具体化されることができる。以下に説明する実施形態は、開示された発明が完成されていることを示すと共に、当業者に本発明の思想を十分に伝えるために提供するものである。図面において、層及び領域の厚みは本発明を明確に説明するために誇張して図示されたものである。   Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol. Further, the present invention is not limited to the embodiment described here, and can be embodied in other forms. The embodiments described below are provided to show that the disclosed invention has been completed and to fully convey the spirit of the present invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity in describing the present invention.

先ず、本発明の実施の形態にかかる電極組立体について説明する。図１は、本発明の実施の形態にかかる電極組立体を示す分解斜視図である。   First, an electrode assembly according to an embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing an electrode assembly according to an embodiment of the present invention.

図１を参照すると、電極組立体１０は、第１電極板２０（以下、陽極板と言う）と、第２電極板３０（以下、陰極板と言う）と、セパレータ４０とを含む。   Referring to FIG. 1, the electrode assembly 10 includes a first electrode plate 20 (hereinafter referred to as an anode plate), a second electrode plate 30 (hereinafter referred to as a cathode plate), and a separator 40.

電極組立体１０は、陽極板２０、陰極板３０及びセパレータ４０が積層され、巻き取られることによりゼリーロール形態に形成される。   The electrode assembly 10 is formed in the form of a jelly roll by laminating and winding up the anode plate 20, the cathode plate 30 and the separator 40.

セパレータ４０は、陽極板２０と陰極板３０との間及び二つの電極板２０、３０の下側あるいは上側に一つずつ位置するので、積層及び巻き取られる二つの電極２０、３０が突き当たる部分に介在されて二つの電極板２０、３０間の短絡を防止する。すなわち、セパレータ４０は、１枚が陽極板２０と陰極板３０との間に介在され、別の１枚が上記陽極板２０とセパレータ４０と陰極板３０との積層体の上または下に積層される。これにより、陽極板２０と陰極板３０との短絡を防止することができる。   Since the separator 40 is located between the anode plate 20 and the cathode plate 30 and below or above the two electrode plates 20, 30, the separator 40 is in contact with the two electrodes 20, 30 that are stacked and wound. The short circuit between the two electrode plates 20 and 30 is prevented by being interposed. That is, one separator 40 is interposed between the anode plate 20 and the cathode plate 30, and another one is laminated on or below the laminate of the anode plate 20, the separator 40 and the cathode plate 30. The Thereby, a short circuit between the anode plate 20 and the cathode plate 30 can be prevented.

陽極板２０は、化学反応により発生する電子を集めて外部回路に伝達する陽極集電体２１と、陽極集電体２１の一側面（一方の面）あるいは両側面（両方の面）に、陽極活物質が含まれた陽極用スラリーが塗布された陽極活物質層２２からなる。   The anode plate 20 collects electrons generated by a chemical reaction and transmits them to an external circuit. The anode plate 20 has anodes on one side (one side) or both sides (both sides) of the anode current collector 21. The anode active material layer 22 is coated with an anode slurry containing an active material.

また、陽極集電体２１の両端のうちの一側または両側には陽極活物質が含まれた陽極用スラリーが塗布されてなく、陽極集電体２１がそのままである陽極集電体露出領域（陽極無地部）２３が形成される。例えば、陽極集電体２１には、その中央部にスラリーが塗布されて陽極活物質層２２が形成され、陽極集電体２１の巻き取り方向における両端部には、スラリーが塗布されずに陽極集電体２１が露出されたままとなる陽極集電体露出領域２３が形成される。   Further, the anode current collector exposed region (wherein the anode current collector 21 is left as it is, without applying the anode slurry containing the anode active material on one or both sides of the both ends of the anode current collector 21). An anode plain portion) 23 is formed. For example, the anode current collector 21 is coated with slurry at the center thereof to form an anode active material layer 22, and the anode current collector 21 is not coated with slurry at both ends in the winding direction. An anode current collector exposed region 23 in which the current collector 21 remains exposed is formed.

陽極集電体２１としては、ステンレス鋼、ニッケル、アルミニウム、チタンまたはこれらの合金、アルミニウムまたはステンレス鋼の表面にカーボン、ニッケル、チタンまたは銀で表面処理したものなどを用いることができる。これらのうち、アルミニウムまたはアルミニウム合金を用いるのがよい。しかし、本発明において、陽極集電体の材質は上記の物質に限定されるものではない。   As the anode current collector 21, stainless steel, nickel, aluminum, titanium, or an alloy thereof, a surface of aluminum or stainless steel that is surface-treated with carbon, nickel, titanium, or silver can be used. Of these, aluminum or an aluminum alloy is preferably used. However, in the present invention, the material of the anode current collector is not limited to the above substances.

陽極集電体２１の形態は、ホイル、フィルム、シート、パンチングされたもの、多孔質体、発泡材などであることができる。また、陽極集電体２１の厚さは、通常１〜５０μｍであることができ、好ましくは１〜３０μｍであるのがよい。しかし、本発明において、陽極集電体の形態及び厚さは、上記の形態及び厚さに限定されるものではない。   The form of the anode current collector 21 can be a foil, a film, a sheet, a punched one, a porous body, a foamed material, or the like. The thickness of the anode current collector 21 can be usually 1 to 50 μm, preferably 1 to 30 μm. However, in the present invention, the form and thickness of the anode current collector are not limited to the above form and thickness.

陽極活物質層２２は、例えば、カーボンブラック（ｃａｒｂｏｎ ｂｌａｃｋ）や黒煙粉末などの導電材及び、活物質を固定させるためのバインダーなどを、陽極活物質に混合させた組成物を用いて形成することができる。   The anode active material layer 22 is formed using, for example, a composition in which a conductive material such as carbon black or black smoke powder and a binder for fixing the active material are mixed with the anode active material. be able to.

上記陽極活物質には、コバルト、マンガン、ニッケルから選択される少なくとも１種とリチウムとの複合酸化物のうちの１種以上のものを用いることができる。しかし、本発明において、陽極活物質を組成する物質は、上記の物質に限定されるものではない。   As the anode active material, one or more of a complex oxide of at least one selected from cobalt, manganese, and nickel and lithium can be used. However, in the present invention, the material composing the anode active material is not limited to the above materials.

陽極集電体露出領域（陽極無地部）２３には、陽極集電体２１に集まった電子を外部回路に伝達する陽極タブ２４が接合される。陽極タブ２４は、ニッケルまたはアルミニウム材質の薄板に形成されることができる。   An anode tab 24 for transmitting electrons collected on the anode current collector 21 to an external circuit is joined to the anode current collector exposed region (anode plain portion) 23. The anode tab 24 can be formed of a thin plate made of nickel or aluminum.

陽極タブ２４が接合された部位には、その上面を覆うように保護部材２５が設けられる。保護部材２５は、陽極タブ２４が陽極集電体露出領域２３に接合された部位を保護して短絡などを防止するために設けられる。かかる保護部材２５に用いることができる材質としては、耐熱性を有する素材、例えばポリエステルのような高分子樹脂を用いることができる。また、保護部材２５は、陽極集電体露出領域２３に接合される陽極タブ２４を完全に覆うことのできる幅と長さを有するのがよい。   A protective member 25 is provided at a portion where the anode tab 24 is joined so as to cover the upper surface thereof. The protection member 25 is provided to protect the portion where the anode tab 24 is joined to the anode current collector exposed region 23 to prevent a short circuit or the like. As a material that can be used for the protective member 25, a heat-resistant material, for example, a polymer resin such as polyester can be used. Further, the protective member 25 preferably has a width and length that can completely cover the anode tab 24 joined to the anode current collector exposed region 23.

また、陽極板２０は、陽極集電体露出領域２３に付着されて、陽極活物質層２２の両端のうち少なくとも一端に隣接して形成される絶縁部材２６を含む。ここで、陽極活物質層２２の両端とは、陽極板２０、陰極板３０及びセパレータ４０を巻き取って電極組立体１０を形成する際の、巻き取り方向における両端である。   The anode plate 20 includes an insulating member 26 attached to the anode current collector exposed region 23 and formed adjacent to at least one end of both ends of the anode active material layer 22. Here, both ends of the anode active material layer 22 are both ends in the winding direction when the anode plate 20, the cathode plate 30 and the separator 40 are wound to form the electrode assembly 10.

絶縁部材２６は、絶縁テープから形成されることができる。上記絶縁テープは、接着層２６ａと、接着層２６ａの一面に付着される絶縁フィルム２６ｂからなることができる。しかし、本発明において、絶縁部材の形状及び材質は、上記の形状及び材質に限定されるものではない。   The insulating member 26 can be formed from an insulating tape. The insulating tape may include an adhesive layer 26a and an insulating film 26b attached to one surface of the adhesive layer 26a. However, in the present invention, the shape and material of the insulating member are not limited to the above shape and material.

上記絶縁テープの接着層２６ａは、例えば、エチレン（Ｅｔｈｙｌｅｎｅ）−アクリル酸エステル（Ａｃｒｙｌｉｃ ｅｓｔｅｒ）共重合体、ゴム系粘着材、エチレン酢酸ビニール共重合体などから成ることができる。また、上記絶縁テープ２６の絶縁フィルム２６ｂは、例えば、ポリプロピレン（Ｐｏｌｙ ｐｒｏｐｙｌｅｎｅ）、ポリエチレンテレフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｔｅｒｅｐｈｔｈａｌａｔｅ）、ポリエチレンナフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｎａｐｈｔｈａｌａｔｅ）などから成ることができる。   The insulating layer 26a of the insulating tape can be made of, for example, ethylene-acrylic ester copolymer, rubber-based adhesive, ethylene vinyl acetate copolymer, or the like. The insulating film 26b of the insulating tape 26 can be made of, for example, polypropylene (Polypropylene), polyethylene terephthalate, polyethylene naphthalate, or the like.

陰極板３０は、化学反応により発生した電子を集めて外部回路に伝達する陰極集電体３１と、陰極集電体３１の一側面（一方の面）あるいは両側面（両方の面）に陰極活物質が含まれた陰極用スラリーが塗布された陰極活物質層３２からなる。   The cathode plate 30 collects the electrons generated by the chemical reaction and transmits them to an external circuit, and the cathode active material on one side (one side) or both sides (both sides) of the cathode current collector 31. The cathode active material layer 32 is coated with a cathode slurry containing a substance.

また、陰極集電体３１の両端のうちの一側または両側には陰極活物質が含まれた陰極用スラリーが塗布されてなく、陰極集電体３１がそのままである陰極集電体露出領域（陰極無地部）３３が形成される。例えば、陰極集電体３１には、その中央部にスラリーが塗布されて陰極活物質層３２が形成され、陰極集電体３１の巻き取り方向における両端部には、スラリーが塗布されずに陰極集電体３１が露出されたままとなる陰極集電体露出領域３３が形成される。   Further, the cathode current collector exposed region (wherein the cathode current collector 31 is left as it is, without applying the cathode slurry containing the cathode active material on one side or both sides of the both ends of the cathode current collector 31). Cathode plain portion) 33 is formed. For example, the cathode current collector 31 is coated with slurry at the center thereof to form a cathode active material layer 32, and the cathode current collector 31 is not coated with slurry at both ends in the winding direction. A cathode current collector exposed region 33 where the current collector 31 remains exposed is formed.

陰極集電体３１としては、ステンレス鋼、ニッケル、銅、チタンまたはこれらの合金、銅またはステンレス鋼の表面にカーボン、ニッケル、チタンまたは銀で表面処理したものなどを用いることができる。これらのうち、銅または銅合金を用いるのがよい。しかし、本発明において、陰極集電体の材質は上記の物質に限定されるものではない。   As the cathode current collector 31, stainless steel, nickel, copper, titanium, or an alloy thereof, or a surface of copper or stainless steel that is surface-treated with carbon, nickel, titanium, or silver can be used. Of these, copper or a copper alloy is preferably used. However, in the present invention, the material of the cathode current collector is not limited to the above materials.

陰極集電体３１の形態は、ホイル、フィルム、シート、パンチングされたもの、多孔質体、発泡材などであることができる。また、陰極集電体３１の厚さは、通常１〜５０μｍであることができ、好ましくは１〜３０μｍであるのがよい。しかし、本発明において、陰極集電体の形態及び厚さは、上記の形態及び厚さに限定されるものではない。   The form of the cathode current collector 31 can be a foil, a film, a sheet, a punched one, a porous body, a foamed material, or the like. Further, the thickness of the cathode current collector 31 can usually be 1 to 50 μm, and preferably 1 to 30 μm. However, in the present invention, the form and thickness of the cathode current collector are not limited to the above form and thickness.

陰極活物質層３２は、例えば、カーボンブラック（ｃａｒｂｏｎ ｂｌａｃｋ）のような導電材及び、例えば、ＰＶＤＦ（Ｐｏｌｙｖｉｎｙｌｉｄｅｎｅ ｆｌｕｏｒｉｄｅ）、ＳＢＲ（Ｓｔｙｒｅｎｅ ｂｕｔａｄｉｅｎｅ ｒｕｂｂｅｒ）、ＰＴＦＥ（Ｐｏｌｙｔｅｌｒａｆｌｕｏｒｏ ｅｔｈｙｌｅｎｅ）などの活物質を固定させるためのバインダーなどを、陰極活物質に混合させた組成物を用いて形成することができる。   The cathode active material layer 32 is, for example, a conductive material such as carbon black and a material for fixing a material such as PVDF (Polyvinylidene fluoride), SBR (Styrene Butadiene rubber), PTFE (Polytelrafluorene), and the like. The binder or the like can be formed using a composition in which the cathode active material is mixed.

上記陰極活物質には、結晶質炭素、非晶質炭素、炭素複合体、炭素纎維などの炭素材料、リチウム金属、リチウム合金などを用いることができる。しかし、本発明おいて、陰極活物質の材質は、上記の材質に限定されるものではない。   As the cathode active material, crystalline carbon, amorphous carbon, carbon composite, carbon fiber such as carbon fiber, lithium metal, lithium alloy, or the like can be used. However, in the present invention, the material of the cathode active material is not limited to the above materials.

陰極集電体露出領域（陰極無地部）３３には、陰極集電体３１に集まった電子を外部回路に伝達する陰極タブ３４が接合される。陰極タブ３４は、ニッケル材質の薄板に形成されることができる。   A cathode tab 34 that transmits electrons collected in the cathode current collector 31 to an external circuit is joined to the cathode current collector exposed region (cathode uncoated region) 33. The cathode tab 34 can be formed of a thin plate made of nickel.

陰極タブ３４が接合された部位には、その上面を覆うように保護部材３５が設けられる。保護部材３５は、陰極タブ３４が陰極集電体露出領域３３に接合された部位を保護して短絡などを防止するために設けられる。かかる保護部材３５に用いることができる材質としては、耐熱性を有する素材、例えばポリエステルのような高分子樹脂を用いることができる。また、保護部材３５は、陰極集電体露出領域３３に接合される陰極タブ３４を完全に覆うことのできる幅と長さを有するのがよい。   A protective member 35 is provided at a portion where the cathode tab 34 is bonded so as to cover the upper surface thereof. The protection member 35 is provided to protect the portion where the cathode tab 34 is joined to the cathode current collector exposed region 33 and prevent a short circuit or the like. As a material that can be used for the protective member 35, a heat-resistant material, for example, a polymer resin such as polyester can be used. Further, the protective member 35 preferably has a width and a length that can completely cover the cathode tab 34 joined to the cathode current collector exposed region 33.

また、陰極板３０は、陰極集電体露出領域３３に付着されて、陰極活物質層３２の両端のうち少なくとも一端に隣接して形成される絶縁部材３６を含む。ここで、陰極活物質層３２の両端とは、陽極板２０、陰極板３０及びセパレータ４０を巻き取って電極組立体１０を形成する際の、巻き取り方向における両端である。   The cathode plate 30 includes an insulating member 36 attached to the cathode current collector exposed region 33 and formed adjacent to at least one end of both ends of the cathode active material layer 32. Here, both ends of the cathode active material layer 32 are both ends in the winding direction when the anode plate 20, the cathode plate 30 and the separator 40 are wound to form the electrode assembly 10.

絶縁部材３６は、絶縁テープから形成されることができる。上記絶縁テープは、接着層と、接着層の一面に付着される絶縁フィルムからなることができる。しかし、本発明において、絶縁部材の形状及び材質は、上記の形状及び材質に限定されるものではない。   The insulating member 36 can be formed from an insulating tape. The insulating tape may include an adhesive layer and an insulating film attached to one surface of the adhesive layer. However, in the present invention, the shape and material of the insulating member are not limited to the above shape and material.

上記絶縁テープの接着層は、例えば、エチレン（Ｅｔｈｙｌｅｎｅ）−アクリル酸エステル（Ａｃｒｙｌｉｃ ｅｓｔｅｒ）共重合体、ゴム系粘着材、エチレン酢酸ビニール共重合体などから成ることができる。また、上記絶縁テープの絶縁フィルムは、例えば、ポリプロピレン（Ｐｏｌｙ ｐｒｏｐｙｌｅｎｅ）、ポリエチレンテレフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｔｅｒｅｐｈｔｈａｌａｔｅ）、ポリエチレンナフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｎａｐｈｔｈａｌａｔｅ）などから成ることができる。   The adhesive layer of the insulating tape can be made of, for example, an ethylene-acrylic ester copolymer, a rubber-based adhesive, an ethylene vinyl acetate copolymer, or the like. The insulating film of the insulating tape may be made of, for example, polypropylene (Polypropylene), polyethylene terephthalate, polyethylene naphthalate, or the like.

セパレータ４０は、一般的な、例えばポリエチレン（Ｐｏｌｙｅｔｈｙｌｅｎｅ）、ポリプロピレン（Ｐｏｌｙ ｐｒｏｐｙｌｅｎｅ）などの熱可塑性樹脂で形成され、その表面は多孔膜構造になっている。このような多孔膜構造は、電池内部の温度上昇により上記熱可塑性樹脂の温度がその融点近くになると、セパレータ４０が溶融して通孔が塞がれることで絶縁フィルムとなる。このように絶縁フィルムに変化することによって、陽極板２０と陰極板３０との間のリチウムイオンの移動が遮断され、それ以上の電流が流れなくなることで電池内部の温度上昇を抑えることができる。   The separator 40 is made of a general thermoplastic resin such as polyethylene (polyethylene) or polypropylene (polypropylene), and the surface thereof has a porous film structure. Such a porous membrane structure becomes an insulating film by melting the separator 40 and closing the through holes when the temperature of the thermoplastic resin becomes close to its melting point due to the temperature rise inside the battery. By changing to the insulating film in this way, the movement of lithium ions between the anode plate 20 and the cathode plate 30 is blocked, and no more current flows, so that the temperature rise inside the battery can be suppressed.

次に、本発明の実施の形態にかかる電極板、すなわち陽極板２０及び陰極板３０について、詳しく説明する。   Next, the electrode plates according to the embodiment of the present invention, that is, the anode plate 20 and the cathode plate 30 will be described in detail.

図２Ａは、本発明の実施の形態にかかる電極組立体の電極板を示す平面図である。また、図２Ｂは、本発明の実施の形態にかかる電極組立体の電極板を示す側面図である。そして、図２Ｃは、本発明の実施の形態の変更例による電極組立体の電極板を示す側面図である。以下、電極板について説明する場合、陽極板２０を例にとって説明することとする。陰極板３０の構成は陽極板２０の構成と同様であるため、陰極板３０についての詳しい説明は省略する。   FIG. 2A is a plan view showing an electrode plate of the electrode assembly according to the embodiment of the present invention. FIG. 2B is a side view showing the electrode plate of the electrode assembly according to the embodiment of the present invention. FIG. 2C is a side view showing an electrode plate of an electrode assembly according to a modification of the embodiment of the present invention. Hereinafter, when the electrode plate is described, the anode plate 20 will be described as an example. Since the configuration of the cathode plate 30 is the same as that of the anode plate 20, a detailed description of the cathode plate 30 is omitted.

図２Ａ〜図２Ｃに示されたように、陽極集電体２１の一側に形成された活物質層２２は、両端部の不均一領域Ａ、Ｂと不均一領域間の均一領域Ｃからなることができる。すなわち、陽極集電体２１にスラリーを塗布し始めるスタート部では、陽極活物質層２２に塗布されたスラリーが連続する均一領域Ｃと比べて固まって多少突き出された不均一領域Ａが形成される。また、陽極集電体２１へのスラリーの塗布が終了する終端部では、引き摺れ現象が発生して陽極活物質層が連続される均一領域Ｃに比べてスラリーが少なく塗布される不均一領域Ｂが発生する。すなわち、陽極活物質層のスタート部は均一領域Ｃより厚さが厚く、陽極活物質層の終端部は均一領域Ｃより厚さが薄く形成される。   As shown in FIGS. 2A to 2C, the active material layer 22 formed on one side of the anode current collector 21 is composed of the non-uniform areas A and B at both ends and the uniform area C between the non-uniform areas. be able to. That is, in the start part where the slurry starts to be applied to the anode current collector 21, a non-uniform region A in which the slurry applied to the anode active material layer 22 is hardened and slightly protruded is formed as compared with the continuous uniform region C. . Further, in the terminal portion where the application of the slurry to the anode current collector 21 is finished, a non-uniform region where the drag phenomenon occurs and the slurry is applied less than the uniform region C where the anode active material layer is continuous. B is generated. That is, the start portion of the anode active material layer is formed thicker than the uniform region C, and the end portion of the anode active material layer is formed thinner than the uniform region C.

例えば、図２Ｂを参照すると、陽極集電体２１には、陽極集電体２１の巻き取り方向における中央部に陽極活物質層２２が形成され、陽極集電体２１の巻き取り方向における両端部は、陽極集電体２１が露出されたままの陽極集電体露出領域２３となる。このとき、図２Ｂに示された陽極集電体２１の上側の面においては、図面の左方向から右方向に陽極活物質が塗布されることにより、陽極活物質層２２が形成されている。すなわち、陽極集電体２１の巻き取り方向に陽極活物質を塗布することにより、陽極活物質層２２が形成される。   For example, referring to FIG. 2B, the anode current collector 21 is formed with an anode active material layer 22 at the center in the winding direction of the anode current collector 21, and both ends of the anode current collector 21 in the winding direction. Becomes the anode current collector exposed region 23 where the anode current collector 21 is exposed. At this time, the anode active material layer 22 is formed on the upper surface of the anode current collector 21 shown in FIG. 2B by applying the anode active material from the left to the right in the drawing. That is, the anode active material layer 22 is formed by applying the anode active material in the winding direction of the anode current collector 21.

そして、図２Ｂの陽極集電体２１の上側の面の領域Ａに示されたように、陽極活物質を塗布する際の塗布開始地点の領域では、陽極活物質が盛り上がって塗布されており、陽極活物質が均一に塗布された均一領域Ｃと比較すると、その厚みが厚くなってしまっている。逆に、図２Ｂの陽極集電体２１の上側の面の領域Ｂに示されたように、陽極活物質を塗布する際の塗布終了地点の領域では、陽極活物質が領域の終端に向かって徐々に薄くなるように塗布されており、陽極活物質が均一に塗布された均一領域Ｃと比較すると、その厚みが薄くなってしまっている。ここで、図２Ｂに示された陽極板２０の下側の面においては、陽極活物質は図面の右方向から左方向に塗布されている。   Then, as shown in the region A on the upper surface of the anode current collector 21 in FIG. 2B, the anode active material is swelled and applied in the region where the anode active material is applied, Compared with the uniform region C in which the anode active material is uniformly applied, the thickness is increased. On the contrary, as shown in the region B on the upper surface of the anode current collector 21 in FIG. 2B, in the region where the anode active material is applied, the anode active material moves toward the end of the region. It is applied so as to be gradually thinner, and its thickness is reduced as compared with the uniform region C where the anode active material is uniformly applied. Here, on the lower surface of the anode plate 20 shown in FIG. 2B, the anode active material is applied from the right to the left in the drawing.

ここで、本発明の実施の形態にかかる電極組立体の陽極板２０は、陽極集電体露出領域２３に付着されて、陽極活物質層２２の両端部のうちの少なくとも一端部に隣接し、上記少なくとも一つの端部と平行するようにストライプ（ｓｔｒｉｐｅ）型に形成される絶縁部材２６を含む。すなわち、絶縁部材２６は、陽極活物質層２２の陽極集電体巻き取り方向の縁部（端部）から所定の距離だけ離隔されて、上記縁部と平行に、陽極集電体２１の陽極集電体露出領域２３に付着されて設けられることができる。また、陽極活物質層２２が陽極集電体２１の両方の面に設けられるとき、絶縁部材２６は、陽極集電体２１の両方の面に設けられることもできるし、一方の面にだけ設けられることもできる。また、絶縁部材２６は、陽極版２０と陰極板３０の両方に設けられることもできるし、一方の電極板にだけ設けられることもできる。   Here, the anode plate 20 of the electrode assembly according to the embodiment of the present invention is attached to the anode current collector exposed region 23 and is adjacent to at least one end of both ends of the anode active material layer 22; The insulating member 26 is formed in a stripe shape so as to be parallel to the at least one end. That is, the insulating member 26 is separated from the edge (end) of the anode active material layer 22 in the winding direction of the anode current collector by a predetermined distance, and in parallel with the edge, the anode of the anode current collector 21 is disposed. It can be provided attached to the current collector exposed region 23. In addition, when the anode active material layer 22 is provided on both surfaces of the anode current collector 21, the insulating member 26 can be provided on both surfaces of the anode current collector 21 or provided only on one surface. It can also be done. Further, the insulating member 26 can be provided on both the anode plate 20 and the cathode plate 30, or can be provided only on one electrode plate.

絶縁部材２６は絶縁テープで形成され、接着層２６ａと接着層２６ａの一面に付着する絶縁フィルム２６ｂからなることができる。しかし、本発明において、絶縁部材２６の形状及び材質は、上記の形状及び材質に限定されるものではない。   The insulating member 26 is formed of an insulating tape, and can include an adhesive layer 26a and an insulating film 26b attached to one surface of the adhesive layer 26a. However, in the present invention, the shape and material of the insulating member 26 are not limited to the above shape and material.

例えば、接着層２６ａは、エチレン（Ｅｔｈｙｌｅｎｅ）−アクリル酸エステル（Ａｃｒｙｌｉｃ ｅｓｔｅｒ）共重合体、ゴム系粘着材、エチレン酢酸ビニール共重合体などから形成されることができる。また、絶縁フィルム２６ｂは、例えば、ポリプロピレン（Ｐｏｌｙ ｐｒｏｐｙｌｅｎｅ）、ポリエチレンテレフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｔｅｒｅｐｈｔｈａｌａｔｅ）、ポリエチレンナフタレート（Ｐｏｌｙｅｔｈｙｌｅｎｅ ｎａｐｈｔｈａｌａｔｅ）などから形成されることができる。   For example, the adhesive layer 26a may be formed of an ethylene-acrylic ester copolymer, a rubber-based adhesive, an ethylene vinyl acetate copolymer, or the like. The insulating film 26b may be formed of, for example, polypropylene (Polypropylene), polyethylene terephthalate (Polyethylene terephthalate), polyethylene naphthalate (Polyethylene naphthalate), or the like.

絶縁部材２６は、陽極活物質層２２の端から３．５ｍｍ以内の間隔を維持するように設けられるのがよい。絶縁部材２６と陽極活物質層２２の端との間隔が３．５ｍｍよりも広くなると、電極組立体を製造する過程において、不均一領域Ａ、不均一領域Ｂなどがセパレータを損傷させ、更にセパレータの損傷により内部的な短絡が発生する恐れがある。   The insulating member 26 is preferably provided so as to maintain an interval within 3.5 mm from the end of the anode active material layer 22. If the distance between the insulating member 26 and the end of the anode active material layer 22 is larger than 3.5 mm, the non-uniform area A, the non-uniform area B, etc. will damage the separator in the process of manufacturing the electrode assembly. An internal short circuit may occur due to damage.

また、絶縁部材２６の厚さは、陽極活物質層２２の厚さと同一の厚さに形成されるのがよい。ここで、塗布されたスラリーが固まって多少突き出される突出部が形成された不均一領域Ａに隣接して形成される絶縁部材２６については、その厚さは突出部の厚さと同一の厚さに形成されるのがよい。すなわち、陽極活物質層２２の突出部の厚みが最も厚い部分は、陽極板２０全体のなかでは局部的に突出していることになり、このような陽極板２０を巻き取って電極組立体１０を形成すれば、かかる突出部に隣接するセパレータ４０が破損する恐れがある。そこで、上記突出部と同じ厚さの絶縁部材２６を上記突出部に隣接して設けることにより、陽極板２０全体として局部的に突出された領域をなくして、セパレータ４０が破損するのを防止することができる。   The insulating member 26 is preferably formed to have the same thickness as the anode active material layer 22. Here, with respect to the insulating member 26 formed adjacent to the non-uniform region A where the applied slurry is solidified and protrudes somewhat, the thickness thereof is the same as the thickness of the protrusion. It is good to be formed. That is, the thickest protruding portion of the anode active material layer 22 protrudes locally in the entire anode plate 20, and the electrode assembly 10 is wound up by winding up the anode plate 20. If formed, the separator 40 adjacent to the protruding portion may be damaged. Therefore, by providing the insulating member 26 having the same thickness as the protruding portion adjacent to the protruding portion, the region protruding locally as the whole anode plate 20 is eliminated and the separator 40 is prevented from being damaged. be able to.

このとき、絶縁部材２６は、図２Ｂに示されたように、陽極活物質層２２と重ならないように形成されることもできるし、図２Ｃに示されたように、絶縁部材２６の絶縁フィルム２６ｂ’のみが陽極活物質層２２の不均一領域Ａ、Ｂを覆うように形成されることもできる。   At this time, the insulating member 26 may be formed so as not to overlap the anode active material layer 22 as shown in FIG. 2B, or the insulating film of the insulating member 26 as shown in FIG. 2C. Only 26 b ′ may be formed so as to cover the non-uniform regions A and B of the anode active material layer 22.

ここで、本発明の実施の形態の変更例による電極組立体について説明する。   Here, an electrode assembly according to a modification of the embodiment of the present invention will be described.

図２Ｃを参照すると、絶縁部材２６’は、絶縁部材２６と同様に、陽極活物質層２２の両端部のうちの少なくとも一端部に隣接し、上記少なくとも一つの端部と平行するように陽極集電体露出領域２３に付着される。すなわち、絶縁部材２６は、陽極活物質層２２の陽極集電体巻き取り方向の縁部（端部）に隣接して、上記縁部と平行に、陽極集電体２１の陽極集電体露出領域２３に付着されて設けられることができる。   Referring to FIG. 2C, similarly to the insulating member 26, the insulating member 26 ′ is adjacent to at least one end of the both ends of the anode active material layer 22 and is parallel to the at least one end. Attached to the electric conductor exposed region 23. That is, the insulating member 26 is adjacent to the edge (end part) of the anode active material layer 22 in the winding direction of the anode current collector and is exposed to the anode current collector of the anode current collector 21 in parallel with the edge. It can be provided attached to the region 23.

ここで、絶縁部材２６’の接着層２６ａ’は、陽極活物質層２２の端から３．５ｍｍ以内の間隔を維持するように設けられるのがよい。   Here, the adhesive layer 26 a ′ of the insulating member 26 ′ is preferably provided so as to maintain a distance within 3.5 mm from the end of the anode active material layer 22.

一方、絶縁部材２６’の絶縁フィルム２６ｂ’は、接着層２６ａ’の一面に付着され、更に陽極活物質層２２の不均一領域ＡまたはＢを覆うように設けられる。すなわち、絶縁部材２６’の絶縁フィルム２６ｂ’は、接着層２６ａ’の上面と、接着層２６ａ’と陽極活物質層２２との間の隙間と、陽極活物質層２２の不均一領域ＡまたはＢとを、一体となって覆うように設けられる。   On the other hand, the insulating film 26 b ′ of the insulating member 26 ′ is attached to one surface of the adhesive layer 26 a ′ and is provided so as to cover the non-uniform region A or B of the anode active material layer 22. That is, the insulating film 26 b ′ of the insulating member 26 ′ has an upper surface of the adhesive layer 26 a ′, a gap between the adhesive layer 26 a ′ and the anode active material layer 22, and a non-uniform region A or B of the anode active material layer 22. Are provided so as to be integrally covered.

上記のように、本発明の実施の形態においては、接着層２６ａ、２６ａ’が陽極活物質層２２と接触しないように設けられるので、陽極活物質層２２と接着層２６ａ、２６ａ’が接触する箇所において、各成分の反応によりコバルト成分以外の異種金属が湧出することを防止することができる。また、絶縁部材２６、２６’の接着層２６ａ、２６ａ’が陽極活物質層２２と重ならないように設けられるので、陽極活物質層２２の反応面積が減少せず、二次電池の充放電効率を向上させることができる。更に、陽極活物質層２２を絶縁部材２６、２６’の接着層２６ａ、２６ａ’が覆う構造ではないので、巻き取られた電極組立体１０の長径が大きくなることを防止することができる。   As described above, in the embodiment of the present invention, since the adhesive layers 26a and 26a ′ are provided so as not to contact the anode active material layer 22, the anode active material layer 22 and the adhesive layers 26a and 26a ′ are in contact with each other. It is possible to prevent a foreign metal other than the cobalt component from flowing out due to the reaction of each component at the location. Further, since the adhesive layers 26a and 26a ′ of the insulating members 26 and 26 ′ are provided so as not to overlap the anode active material layer 22, the reaction area of the anode active material layer 22 does not decrease, and the charge / discharge efficiency of the secondary battery Can be improved. Further, since the anode active material layer 22 is not structured to be covered with the adhesive layers 26a and 26a 'of the insulating members 26 and 26', it is possible to prevent the length of the wound electrode assembly 10 from increasing.

また、陽極活物質層２２の均一領域Ｃとほぼ同じ厚さの絶縁部材２６、２６’を、陽極活物質層２２の巻き取り方向の端部に隣接して設けたことにより、絶縁部材２６、２６’から陽極活物質層２２にかけての厚みが均一になり、電極組立体１０の巻き取り時にセパレータが破損されるのを防止することができる。   Further, the insulating members 26 and 26 ′ having substantially the same thickness as the uniform region C of the anode active material layer 22 are provided adjacent to the end portion in the winding direction of the anode active material layer 22. The thickness from 26 'to the anode active material layer 22 becomes uniform, and it is possible to prevent the separator from being damaged when the electrode assembly 10 is wound.

次に、本発明の実施の形態にかかる電極組立体を用いた二次電池について詳細に説明する。図３は、本発明の実施の形態にかかる電極組立体が缶に収容された二次電池を示す分解斜視図である。図４は、本発明の実施の形態にかかる電極組立体がパウチに収容された二次電池を示す分解斜視図である。   Next, a secondary battery using the electrode assembly according to the embodiment of the present invention will be described in detail. FIG. 3 is an exploded perspective view showing a secondary battery in which the electrode assembly according to the embodiment of the present invention is accommodated in a can. FIG. 4 is an exploded perspective view showing a secondary battery in which the electrode assembly according to the embodiment of the present invention is housed in a pouch.

図３を参照すると、二次電池１００は、外装材１１０、外装材１１０の内部に収容されるゼリーロ−ル型の電極組立体１２０及び、外装材１１０の一端に結合されるキャップ組立体１３０を含む。   Referring to FIG. 3, the secondary battery 100 includes an exterior material 110, a jelly-roll type electrode assembly 120 accommodated in the exterior material 110, and a cap assembly 130 coupled to one end of the exterior material 110. Including.

外装材１１０は、その一端が開口された形状を有した金属材から成り、外装材１１０自体が端子の役割を担うことができる。外装材１１０の形状は、例えば、円筒型、角柱型、または、その角部が丸みを有するように形成された柱型などであることができる。また、外装材１１０は、例えば、鉄材、アルミニウムなどの材質を用いて、ディップドローイング方法などにより形成されることができる。   The exterior material 110 is made of a metal material having a shape with one end opened, and the exterior material 110 itself can serve as a terminal. The shape of the exterior material 110 may be, for example, a cylindrical shape, a prismatic shape, or a pillar shape formed so that corners thereof are rounded. Further, the exterior material 110 can be formed by a dip drawing method or the like using a material such as iron or aluminum, for example.

電極組立体１２０は、第１電極板１２２、第２電極板１２４及び、第１電極板１２２と第２電極板１２４との間に介在されるセパレータ１２５を含み、これらが巻き取られて電極組立体１２０が形成される。また、第１電極板１２２には第１電極タブ１２１が接続され、第２電極板１２４には第２電極タブ１２３が接続される。   The electrode assembly 120 includes a first electrode plate 122, a second electrode plate 124, and a separator 125 interposed between the first electrode plate 122 and the second electrode plate 124. A solid 120 is formed. A first electrode tab 121 is connected to the first electrode plate 122, and a second electrode tab 123 is connected to the second electrode plate 124.

第１電極板１２２及び第２電極板１２４には、図１、図２Ａ、図２Ｂ及び、図２Ｃを参照して説明した絶縁部材が備えられるが、絶縁部材についての詳細な説明はここでは省略する。   The first electrode plate 122 and the second electrode plate 124 are provided with the insulating member described with reference to FIGS. 1, 2A, 2B, and 2C, but detailed description of the insulating member is omitted here. To do.

キャップ組立体１３０は、電極組立体１２０の上に順に設けられる絶縁ケース１３６、ターミナルプレート１３５、絶縁プレート１３４及びキャッププレート１３１と、キャッププレート１３１に装着されるガスケット１３３と、キャッププレート１３１に挿通される電極端子１３２とを含んで構成されることができる。   The cap assembly 130 is inserted through the insulating case 136, the terminal plate 135, the insulating plate 134, the cap plate 131, the gasket 133 attached to the cap plate 131, and the cap plate 131 that are sequentially provided on the electrode assembly 120. The electrode terminal 132 can be configured.

キャッププレート１３１は、外装材１１０の開口部と対応する大きさと形状を有し、平板型に形成される。キャッププレート１３１の一面には、端子通孔１３１ａ及び電解液注入口１３１ｂが、キャッププレート１３１を貫通して形成される。   The cap plate 131 has a size and shape corresponding to the opening of the exterior material 110 and is formed in a flat plate shape. On one surface of the cap plate 131, a terminal through hole 131 a and an electrolyte solution inlet 131 b are formed through the cap plate 131.

電解液注入口１３１ｂは、電解液を注入するために設けられ、電解液注入口栓１３１ｃが結合されることにより密閉されることができる。   The electrolyte solution inlet 131b is provided for injecting the electrolyte solution, and can be sealed by coupling the electrolyte solution inlet plug 131c.

端子通孔１３１ａには、電極端子１３２が挿通される。電極端子１３２の外側には、電極端子１３２をキャッププレート１３１と電気的に絶縁させるために、チューブ状のガスケット１３３が設けられる。   The electrode terminal 132 is inserted through the terminal through hole 131a. A tube-shaped gasket 133 is provided outside the electrode terminal 132 in order to electrically insulate the electrode terminal 132 from the cap plate 131.

絶縁プレート１３４は、キャッププレート１３１の下面に配設される。絶縁プレート１３４にも、電極端子１３２が挿通されるように、キャッププレート１３１の端子通孔１３１ａと対応する位置に孔が形成される。   The insulating plate 134 is disposed on the lower surface of the cap plate 131. A hole is also formed in the insulating plate 134 at a position corresponding to the terminal through hole 131a of the cap plate 131 so that the electrode terminal 132 is inserted therethrough.

ターミナルプレート１３５は、絶縁プレート１３４の下面に配設される。ターミナルプレート１３５にも、電極端子１３２が挿通されるように、キャッププレート１３１の端子通孔１３１ａと対応する位置に孔が形成される。   The terminal plate 135 is disposed on the lower surface of the insulating plate 134. A hole is also formed in the terminal plate 135 at a position corresponding to the terminal through hole 131a of the cap plate 131 so that the electrode terminal 132 is inserted.

キャッププレート１３１の下面には、第１電極板１２２から引出されて第１電極板１２２と電気的に接続された第１電極タブ１２１が溶接される。また、ターミナルプレート１３５の下面には、第２電極板１２４から引出されて第２電極板１２４と電気的に接続された第２電極タブ１２３が溶接される。   A first electrode tab 121 drawn from the first electrode plate 122 and electrically connected to the first electrode plate 122 is welded to the lower surface of the cap plate 131. A second electrode tab 123 drawn from the second electrode plate 124 and electrically connected to the second electrode plate 124 is welded to the lower surface of the terminal plate 135.

絶縁ケース１３６は、外装材１１０に収容された電極組立体１２０の上面に設けられて、電極組立体１２０とキャップ組立体１３０を電気的に絶縁させる役割を果たす。   The insulating case 136 is provided on the upper surface of the electrode assembly 120 accommodated in the exterior material 110 and serves to electrically insulate the electrode assembly 120 from the cap assembly 130.

絶縁ケース１３６には、キャッププレート１３１に形成された電解液注入口１３１ｂと対応する位置に電解液注入通孔１３６ａが形成される。また、絶縁ケース１３６には、第１電極タブ１２１が引出される引出し溝（引出しグルーブ）１３６ｂ、及び、第２電極タブ１２３が引出される引出し孔（引出しホール）１３６ｃが形成される。引出し溝１３６ｂ及び引出し孔１３６ｃは、第１電極タブ１２１及び第２電極タブ１２３が相互に所定の距離だけ離隔されて外部に引き出されるように、第１電極タブ１２１及び第２電極タブ１２３をガイドする役割を果たす。   In the insulating case 136, an electrolyte injection hole 136a is formed at a position corresponding to the electrolyte injection port 131b formed in the cap plate 131. The insulating case 136 is formed with a drawing groove (drawing groove) 136b from which the first electrode tab 121 is drawn and a drawing hole (drawing hole) 136c from which the second electrode tab 123 is drawn. The lead groove 136b and the lead hole 136c guide the first electrode tab 121 and the second electrode tab 123 so that the first electrode tab 121 and the second electrode tab 123 are separated from each other by a predetermined distance. To play a role.

上記のように形成された二次電池は、過電流、過放電または、過充電などの、安全上の問題を解決するための保護素子がその一面に実装された保護回路基板をさらに備えることもできる。   The secondary battery formed as described above may further include a protection circuit board on which a protection element for solving safety problems such as overcurrent, overdischarge, or overcharge is mounted. it can.

また、二次電池の見掛けを保護するために、二次電池の外側にチュービングまたはラベリングをさらに実施することもできる。すなわち、二次電池の外側面を覆うようにチューブ形態またはラベル形態の外装を設けて、二次電池の外側を保護するように構成することもできる。   In addition, in order to protect the appearance of the secondary battery, tubing or labeling can be further performed on the outside of the secondary battery. That is, it is also possible to provide a tube-shaped or label-shaped exterior so as to cover the outer surface of the secondary battery so as to protect the outer side of the secondary battery.

または、別途の外部ケースをさらに備えて、二次電池の外側に結合させることにより、二次電池の外側を保護するように構成することもできる。   Alternatively, a separate external case may be further provided and coupled to the outside of the secondary battery to protect the outside of the secondary battery.

次に、電極組立体がパウチに収容された二次電池について説明する。   Next, the secondary battery in which the electrode assembly is accommodated in the pouch will be described.

図４を参照すると、二次電池２００は、上部外装材２１１及び下部外装材２１２からなるパウチ型の外装材２１０及び、外装材２１０に収容される電極組立体２２０を含んで構成される。   Referring to FIG. 4, the secondary battery 200 includes a pouch-type exterior material 210 including an upper exterior material 211 and a lower exterior material 212, and an electrode assembly 220 accommodated in the exterior material 210.

上部外装材２１１及び下部外装材２１２は、それぞれの一端（一辺）が相互に接合されて、残りの端部（辺）は開放されて、電極組立体２２０が収容されるように形成される。   The upper exterior material 211 and the lower exterior material 212 are formed so that one end (one side) thereof is joined to each other and the remaining end (side) is opened to accommodate the electrode assembly 220.

上部外装材２１１または下部外装材２１２のうちのいずれか１つの外装材には、電極組立体２２０を収容することができる空間が形成される。図４には、下部外装材２１２に電極組立体２２０を収容する空間が形成された場合が示されている。   A space that can accommodate the electrode assembly 220 is formed in any one of the upper exterior material 211 and the lower exterior material 212. FIG. 4 shows a case where a space for accommodating the electrode assembly 220 is formed in the lower exterior material 212.

上部外装材２１１及び下部外装材２１２の端には、熱融着などの方法で密封された上部シーリング部２１１ａ及び下部シーリング部２１２ａが形成される。外装材２１０は、上部外装材２１１及び下部外装材２１２の縁に沿って形成された上部シーリング部２１１ａ及び下部シーリング部２１２ａが、熱融着などの方法によって結合されることにより密閉されることができる。   At the ends of the upper exterior material 211 and the lower exterior material 212, an upper sealing portion 211a and a lower sealing portion 212a that are sealed by a method such as heat fusion are formed. The exterior material 210 may be sealed by joining an upper sealing portion 211a and a lower sealing portion 212a formed along the edges of the upper exterior material 211 and the lower exterior material 212 by a method such as heat fusion. it can.

外装材２１０は、熱融着層２１０ａと、金属層２１０ｂと、絶縁膜２１０ｃとからなる多層構造に形成される。熱融着層２１０ａは、熱融着性を有して、シーリング材としての役割を果たすことができる。金属層２１０ｂは、機械的強度を維持し、水分と酸素のバリア層の役割を果たすことができる。金属層２１０ｂは、外装材２１０に機械的強度を付与し、外部の水分及び酸素が二次電池の内部に進入するのを防止するバリアとして機能することができる。   The exterior material 210 is formed in a multilayer structure including a heat-fusible layer 210a, a metal layer 210b, and an insulating film 210c. The heat sealing layer 210a has a heat sealing property, and can serve as a sealing material. The metal layer 210b maintains mechanical strength and can serve as a moisture and oxygen barrier layer. The metal layer 210b can provide mechanical strength to the exterior material 210 and function as a barrier that prevents external moisture and oxygen from entering the inside of the secondary battery.

電極組立体２２０は、第１電極板２２２、第２電極板２２４及び、第１電極板２２２と第２電極板２２４との間に介在されるセパレータ２２５を含み、これらが巻き取られて電極組立体２２０が形成される。また、第１電極板２２２には第１電極タブ２２１が接続され、第２電極板２２４には第２電極タブ２２３が接続される。   The electrode assembly 220 includes a first electrode plate 222, a second electrode plate 224, and a separator 225 interposed between the first electrode plate 222 and the second electrode plate 224, and these are wound to form an electrode assembly. A solid 220 is formed. The first electrode tab 222 is connected to the first electrode plate 222, and the second electrode tab 223 is connected to the second electrode plate 224.

第１電極板２２２及び第２電極板２２４には、図１、図２Ａ、図２Ｂ及び、図２Ｃを参照して説明した絶縁部材が備えられるが、絶縁部材についての詳細な説明はここでは省略する。   The first electrode plate 222 and the second electrode plate 224 are provided with the insulating members described with reference to FIGS. 1, 2A, 2B, and 2C, but detailed description of the insulating members is omitted here. To do.

また、第１電極タブ２２１及び第２電極タブ２２３のシーリング部２１１ａ、２１２ａと重なる位置には、外装材２１０の密封性を高めるように、タブテープ２２６及びタブテープ２２７をさらに備えることができる。   In addition, a tab tape 226 and a tab tape 227 may be further provided at positions overlapping the sealing portions 211 a and 212 a of the first electrode tab 221 and the second electrode tab 223 so as to improve the sealing performance of the exterior material 210.

上記のように形成された二次電池は、過電流、過放電または、過充電などの安全上の問題を解決するための保護素子がその一面に実装された保護回路基板をさらに備えることもできる。   The secondary battery formed as described above may further include a protection circuit board on which a protection element for solving safety problems such as overcurrent, overdischarge, or overcharge is mounted. .

また、二次電池の見掛けを保護するために、二次電池の外側にチュービングまたはラベリングをさらに実施することもできる。すなわち、二次電池の外側面を覆うようにチューブ形態またはラベル形態の外装を設けて、二次電池の外側を保護するように構成することもできる。   In addition, in order to protect the appearance of the secondary battery, tubing or labeling can be further performed on the outside of the secondary battery. That is, it is also possible to provide a tube-shaped or label-shaped exterior so as to cover the outer surface of the secondary battery so as to protect the outer side of the secondary battery.

以上、添付図面を参照しながら本発明の好適な実施形態について説明したが、本発明は係る例に限定されないことは言うまでもない。当業者であれば、特許請求の範囲に記載された範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

本発明は、電極組立体及びそれを備えた二次電池に適用可能である。   The present invention is applicable to an electrode assembly and a secondary battery including the electrode assembly.

本発明の実施の形態にかかる電極組立体を示す分解斜視図である。It is a disassembled perspective view which shows the electrode assembly concerning embodiment of this invention. 本発明の実施の形態にかかる電極組立体の電極板の構成を示す平面図である。It is a top view which shows the structure of the electrode plate of the electrode assembly concerning embodiment of this invention. 本発明の実施の形態にかかる電極組立体の電極板の構成を示す側面図である。It is a side view which shows the structure of the electrode plate of the electrode assembly concerning embodiment of this invention. 本発明の実施の形態の変更例による電極組立体の電極板の構成を示す側面図である。It is a side view which shows the structure of the electrode plate of the electrode assembly by the modification of embodiment of this invention. 本発明の実施の形態にかかる電極組立体が缶に収容された二次電池を示す斜視図である。It is a perspective view which shows the secondary battery with which the electrode assembly concerning embodiment of this invention was accommodated in the can. 本発明の実施の形態にかかる電極組立体がパウチに収容された二次電池を示す斜視図である。It is a perspective view which shows the secondary battery by which the electrode assembly concerning embodiment of this invention was accommodated in the pouch.

符号の説明Explanation of symbols

１０、１２０、２２０ 電極組立体
２０ 陽極板
２１ 陽極集電体
２２ 陽極活物質層
２３ 陽極集電体露出領域（陽極無地部）
２４ 陽極タブ
２５、３５ 保護部材
２６、２６’、３６ 絶縁部材
２６ａ、２６ａ’ 接着層
２６ｂ、２６ｂ’ 絶縁フィルム
３０ 陰極板
３１ 陰極集電体
３２ 陰極活物質層
３３ 陰極集電体露出領域（陰極無地部）
３４ 陰極タブ
４０、１２５、２２５ セパレータ
１００、２００ 二次電池
１１０、２１０ 外装材
１２１、１２３、２２１、２２３ 電極タブ
１２２、１２４、２２２、２２４ 電極板
１３０ キャップ組立体
１３１ キャッププレート
１３１ａ 端子通孔
１３１ｂ 電解液注入口
１３１ｃ 電解液注入口栓
１３２ 電極端子
１３３ ガスケット
１３４ 絶縁プレート
１３５ ターミナルプレート
１３６ 絶縁ケース
１３６ａ 電解液注入通孔
１３６ｂ 引出し溝（引出しグルーブ）
１３６ｃ 引出し孔（引出しホール）
２１０ａ 熱融着層
２１０ｂ 金属層
２１０ｃ 絶縁膜
２１１ 上部外装材
２１１ａ 上部シーリング部
２１２ 下部外装材
２１２ａ 下部シーリング部
２２６、２２７ タブテープ
Ａ、Ｂ 不均一領域
Ｃ 均一領域 10, 120, 220 Electrode assembly 20 Anode plate 21 Anode current collector 22 Anode active material layer 23 Anode current collector exposed region (anode uncoated region)
24 Anode tab 25, 35 Protective member 26, 26 ', 36 Insulating member 26a, 26a' Adhesive layer 26b, 26b 'Insulating film 30 Cathode plate 31 Cathode current collector 32 Cathode active material layer 33 Cathode current collector exposed region (cathode) Plain part)
34 Cathode tab 40, 125, 225 Separator 100, 200 Secondary battery 110, 210 Exterior material 121, 123, 221, 223 Electrode tab 122, 124, 222, 224 Electrode plate 130 Cap assembly 131 Cap plate 131a Terminal through hole 131b Electrolyte inlet 131c Electrolyte inlet plug 132 Electrode terminal 133 Gasket 134 Insulating plate 135 Terminal plate 136 Insulating case 136a Electrolyte injecting hole 136b Drawer groove (drawer groove)
136c Drawer hole (drawer hole)
210a Thermal fusion layer 210b Metal layer 210c Insulating film 211 Upper exterior material 211a Upper sealing part 212 Lower exterior material 212a Lower sealing part 226, 227 Tab tape A, B Non-uniform area C Uniform area

Claims (15)

陽極集電体と、前記陽極集電体上に形成された陽極活物質層と、前記陽極集電体上に設けられた陽極集電体露出領域とを備えた陽極板と、
陰極集電体と、前記陰極集電体上に形成された陰極活物質層と、前記陰極集電体上に設けられた陰極集電体露出領域とを備えた陰極板と、
前記陽極板と前記陰極板との間に介在されるセパレータとを含み、
前記陽極活物質層または／および前記陰極活物質層の電極組立体の巻き取り方向の両端のうちの少なくともいずれかの端部に隣接して、前記陽極集電体露出領域または前記陰極集電体露出領域の少なくとも一面に配設される絶縁部材を備え、
前記陽極活物質層及び前記陰極活物質層は、陽極用スラリーまたは陰極用スラリーが均一に塗布された均一領域及び、前記陽極用スラリーまたは前記陰極用スラリーが均一に塗布されない不均一領域を有し、
前記絶縁部材は、接着層と前記接着層の一面に付着される絶縁フィルムからなり、
前記接着層は、前記陽極活物質層または前記陰極活物質層の前記電極組立体の巻き取り方向の両端部の前記不均一領域に隣接して位置し、かつ、前記陽極活物質層または前記陰極活物質層と接触しないように設けられ、
前記絶縁フィルムは、前記不均一領域を覆うことを特徴とする電極組立体。 An anode plate comprising: an anode current collector; an anode active material layer formed on the anode current collector; and an anode current collector exposed region provided on the anode current collector;
A cathode plate comprising a cathode current collector, a cathode active material layer formed on the cathode current collector, and a cathode current collector exposed region provided on the cathode current collector;
Including a separator interposed between the anode plate and the cathode plate,
The anode current collector exposed region or the cathode current collector is adjacent to at least one of both ends of the anode active material layer and / or the cathode active material layer in the winding direction of the electrode assembly. Comprising an insulating member disposed on at least one surface of the exposed region;
The anode active material layer and the cathode active material layer have a uniform region where the anode slurry or the cathode slurry is uniformly applied, and a non-uniform region where the anode slurry or the cathode slurry is not uniformly applied. ,
The insulating member comprises an adhesive layer and an insulating film attached to one surface of the adhesive layer,
The adhesive layer is located adjacent to the non-uniform region at both ends of the anode active material layer or the cathode active material layer in the winding direction of the electrode assembly, and the anode active material layer or the cathode Provided so as not to contact the active material layer,
The electrode assembly, wherein the insulating film covers the non-uniform region. 前記接着層は、前記陽極活物質層または前記陰極活物質層の前記電極組立体の巻き取り方向の両端部の各端部から、３．５ｍｍ以内の間隔で離隔されて設けられることを特徴とする、請求項１に記載の電極組立体。   The adhesive layer is provided at an interval of 3.5 mm or less from each end of the anode active material layer or the cathode active material layer at both ends in the winding direction of the electrode assembly. The electrode assembly according to claim 1. 前記絶縁部材の前記接着層と前記絶縁フィルムとを合わせた厚さは、前記陽極活物質層または前記陰極活物質層の前記均一領域の厚さと同一であることを特徴とする、請求項１に記載の電極組立体。 The combined thickness of the adhesive layer and the insulating film of the insulating member is the same as the thickness of the uniform region of the anode active material layer or the cathode active material layer. The electrode assembly as described. 前記不均一領域は、前記陽極用スラリーまたは前記陰極用スラリーを塗布する際の、塗布開始領域及び塗布終了領域であることを特徴とする、請求項１に記載の電極組立体。   2. The electrode assembly according to claim 1, wherein the non-uniform region is a coating start region and a coating end region when the anode slurry or the cathode slurry is applied. 前記塗布開始領域は前記均一領域の厚さよりも厚く形成され、前記塗布終了領域は前記均一領域の厚さよりも薄く形成されることを特徴とする、請求項４に記載の電極組立体。   The electrode assembly according to claim 4, wherein the coating start region is formed thicker than the uniform region, and the coating end region is formed thinner than the uniform region. 前記塗布開始領域に隣接して形成された前記絶縁部材の前記接着層と前記絶縁フィルムとを合わせた厚さは、前記塗布開始領域の厚さと同一であることを特徴とする、請求項４に記載の電極組立体。 5. The thickness of the insulating member formed adjacent to the application start region and the insulating film is equal to the thickness of the application start region according to claim 4. The electrode assembly as described. 外装材と；
前記外装材に収容され、
陽極集電体と、前記陽極集電体上に形成された陽極活物質層と、前記陽極集電体上に設けられた陽極集電体露出領域と、を備えた陽極板と、
陰極集電体と、前記陰極集電体上に形成された陰極活物質層と、前記陰極集電体上に設けられた陰極集電体露出領域と、を備えた陰極板と、
前記陽極板と前記陰極板との間に介在されるセパレータと、
を含む電極組立体と；
を含み、
前記電極組立体は、前記陽極活物質層または／および前記陰極活物質層の前記電極組立体の巻き取り方向の両端のうちの少なくともいずれかの端部に隣接して、前記陽極集電体露出領域または前記陰極集電体露出領域の少なくとも一面に配設される絶縁部材を備え、
前記陽極活物質層及び前記陰極活物質層は、陽極用スラリーまたは陰極用スラリーが均一に塗布された均一領域及び、前記陽極用スラリーまたは前記陰極用スラリーが均一に塗布されない不均一領域を有し、
前記絶縁部材は、接着層と前記接着層の一面に付着される絶縁フィルムからなり、
前記接着層は、前記陽極活物質層または前記陰極活物質層の前記電極組立体の巻き取り方向の両端部の前記不均一領域に隣接して位置し、かつ、前記陽極活物質層または前記陰極活物質層と接触しないように設けられ、
前記絶縁フィルムは、前記不均一領域を覆うことを特徴とする二次電池。 With exterior materials;
Housed in the exterior material,
An anode plate comprising: an anode current collector; an anode active material layer formed on the anode current collector; and an anode current collector exposed region provided on the anode current collector;
A cathode plate comprising: a cathode current collector; a cathode active material layer formed on the cathode current collector; and a cathode current collector exposed region provided on the cathode current collector;
A separator interposed between the anode plate and the cathode plate;
An electrode assembly comprising:
Including
The electrode assembly is exposed to the anode current collector adjacent to at least one of the ends of the anode active material layer and / or the cathode active material layer in the winding direction of the electrode assembly. An insulating member disposed on at least one surface of the region or the cathode current collector exposed region,
The anode active material layer and the cathode active material layer have a uniform region where the anode slurry or the cathode slurry is uniformly applied, and a non-uniform region where the anode slurry or the cathode slurry is not uniformly applied. ,
The insulating member comprises an adhesive layer and an insulating film attached to one surface of the adhesive layer,
The adhesive layer is located adjacent to the non-uniform region at both ends of the anode active material layer or the cathode active material layer in the winding direction of the electrode assembly, and the anode active material layer or the cathode Provided so as not to contact the active material layer,
The secondary battery is characterized in that the insulating film covers the non-uniform region. 前記外装材の形状は、円筒型、角柱型または、角に丸みを有する柱型のうちのいずれかの形状に形成されることを特徴とする、請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein a shape of the exterior material is any one of a cylindrical shape, a prismatic shape, and a pillar shape having rounded corners. 前記外装材は、一方の端部に開口部が形成され、前記開口部にキャップ組立体が装着されることを特徴とする、請求項８に記載の二次電池。   The secondary battery according to claim 8, wherein the exterior material has an opening at one end, and a cap assembly is attached to the opening. 前記外装材は、パウチ型であることを特徴とする、請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the exterior material is a pouch type. 前記接着層は、前記陽極活物質層または前記陰極活物質層の前記電極組立体の巻き取り方向の端部から、３．５ｍｍ以内の間隔で離隔されて設けられることを特徴とする、請求項７に記載の二次電池。   The adhesive layer is provided at an interval of 3.5 mm or less from an end of the anode active material layer or the cathode active material layer in a winding direction of the electrode assembly. The secondary battery according to 7. 前記絶縁部材の前記接着層と前記絶縁フィルムとを合わせた厚さは、前記陽極活物質層または前記陰極活物質層の前記均一領域の厚さと同一であることを特徴とする、請求項７に記載の二次電池。 The combined thickness of the adhesive layer and the insulating film of the insulating member is the same as the thickness of the uniform region of the anode active material layer or the cathode active material layer. The secondary battery as described. 前記不均一領域は、前記陽極用スラリーまたは前記陰極用スラリーを塗布する際の、塗布開始領域及び塗布終了領域であることを特徴とする、請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the non-uniform region is a coating start region and a coating end region when the anode slurry or the cathode slurry is applied. 前記塗布開始領域は前記均一領域の厚さよりも厚く形成され、前記塗布終了領域は前記均一領域の厚さよりも薄く形成されることを特徴とする、請求項１３に記載の二次電池。   The secondary battery according to claim 13, wherein the application start region is formed thicker than the uniform region, and the application end region is formed thinner than the uniform region. 前記塗布開始領域に隣接して形成された前記絶縁部材の前記接着層と前記絶縁フィルムとを合わせた厚さは、前記塗布開始領域の厚さと同一であることを特徴とする、請求項１３に記載の二次電池。 The combined thickness of the insulating member and the insulating film of the insulating member formed adjacent to the application start region is the same as the thickness of the application start region. The secondary battery as described.
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